32 results about "Isoprenol" patented technology

The invention contemplates certain polyethers, polyether derivatives, and methods of making and using those same polymers. For example, the starting materials can, e.g., citronellol, prenol, isocitronellol and isoprenol.

The invention relates to a modified polycarboxylate water reducer and a preparation method thereof. Isoprenol polyoxyethylene ether (TPEG), acrylic acid (AA) and modification monomer X are taken as monomers, and under the action of an initiator and a chain transfer agent, direct polymerization is performed to prepare the composite polycarboxylate water reducer which reduces water and retains slump. The modified polycarboxylate water reducer provided by the invention can be independently used or mixed with other water reducers for use, has an excellent slump retaining performance and good expansibility when the water reducer is used in concrete, has a dispersion delay effect on the concrete in an hour, and has a comprehensive performance exceeding the performances of existing products in the market.

This disclosure generally relates to the use of enzyme combinations or recombinant microbes comprising same to make isoprenoid precursors, isoprenoids and derivatives thereof including prenylated aromatic compounds. Novel metabolic pathways exploiting Claisen, aldol, and acyioin condensations are used instead of the natural mevalonate (MVA) pathway or 1-deoxy-d-xylulose 5-phosphate (DXP) pathways for generating isoprenoid precursors such as isopentenyl pyrophosphate (IPP), dimethylallyl pyrophosphate (DMAPP), and geranyl pyrophosphate (GPP). These pathways have the potential for better carbon and or energy efficiency than native pathways. Both decarboxylative and non-carboxylative condensations are utilized, enabling product synthesis from a number of different starting compounds. These condensation reactions serve as a platform for the synthesis of isoprenoid precursors when utilized in combination with a variety of metabolic pathways and enzymes for carbon rearrangement and the addition / removal of functional groups. Isoprenoid alcohols are key intermediary products for the production of isoprenoid precursors in these novel synthetic metabolic pathways.

The invention provides a water reducing agent and a preparation method thereof, an antifreeze agent and its use, and concrete, and relates to the technical field of antifreeze. The water reducing agent includes the following raw materials: prenol polyoxyethylene ether and allyl alcohol polyoxyethylene ether, and at least one of acrylic acid and maleic anhydride, wherein the prenol polyoxyethylene ether and the The molar ratio of the allyl alcohol polyoxyethylene ether is 1:(0.5-1). Antifreezes include the aforementioned water reducers and non-oxidizing salts. In the water reducing agent, isoprenol polyoxyethylene ether and allyl alcohol polyoxyethylene ether are used to synthesize the water reducing agent. Workability, when the water reducer is used in antifreeze, because the water reducer has strong early strength properties, it can effectively reduce the use of antifreeze early strength components in antifreeze; antifreeze is safe and conducive to Reducing the alkali content in concrete can effectively reduce the risk of concrete bleeding.

The invention discloses a polycarboxylic acid water reducer for a pre-stressed high-strength concrete pipe pile. The water reducer comprise the following components: methallyl polyoxyethylene ether 2400, isoprenol polyoxyethylene ether 2400, acrylic acid, maleic anhydride, sodium methacryl sulfonate, N-hydroxymethyl acrylamide, a 30% sodium hydroxide solution, a chain transfer agent, an oxidant, a reductant, a water softener and a 30% sodium hydroxide solution used for adjusting the pH value of the solution, wherein the mass ratio of methallyl polyoxyethylene ether 2400 to isoprenol polyoxyethylene ether 2400 is 1:(0.5-2) and the mass ratio of acrylic acid to maleic anhydride is 1:(0-1). The polycarboxylic acid water reducer disclosed by the invention is reliable in quality and when the polycarboxylic acid water reducer is applied in concrete, the concrete has the advantages of low entrained air, short setting time, high strength, good cohesiveness, easiness for centrifugal dehydration and less in possibility of pulp hanging.

Theinvention provides a high molecular polymer, a preparation method thereof and an electrolyte containing the same. The high molecular polymer is shown in a formula (I), and is polymerized from monomeric isoprenol, methyl methacrylate, methacrylic acid, undecylenic acid and acrylic acid. The electrolyte uses the high molecular polymer shown in the formula (I) as a main solute. The 650V ultrahighvoltage capacitor prepared from the electrolyte meets the use requirements, and is more excellent in leakage current, loss and high temperature storage than similar capacitor products.

The invention discloses a method for synthesizing prenol employing selective hydrogenation of 3-methylcrotonaldehyde. The method comprises the following steps: feeding, nitrogen and hydrogen substitution, hydrogenation reaction, and separation. The used raw materials comprise 1 part of 3-methylcrotonaldehyde, 0.1-10 parts of water and 0.02-0.2 part of a catalyst; and the used catalyst is a water-soluble complex which is formed by a water-soluble salt of the group VIII metal and a water-soluble ligand. The 3-methylcrotonaldehyde conversion ratio and the selectivity of prenol of the synthetic reaction are high; a water phase of the catalyst can be applied repeatedly for over 20 times; the unit consumption of the catalyst is low; the production cost is greatly reduced; and the method is suitable for industrial production.

The invention belongs to the field of chemical engineering and particularly relates to isomerization synthesis of 3-methyl-2-buten-1-ol using methyl butenol in a water-containing condition. In the invention, the methyl butenol is adopted as a raw material for isomerization synthesis of 3-methyl-2-buten-1-ol; in the reaction materials, the water content is 0.5-6.5%; the catalyst is vanadium oxide or vanadium-containing metal salt; the catalyst concentration is 0.1-5.0%, the reaction temperature is 120-190 DEG C, and the reaction time is 20-180min; the purity of the obtained 3-methyl-2-buten-1-ol product is higher than or equal to 98%; and the 3-methyl-2-buten-1-ol selectivity in the reaction process can be controlled at 95% or above. The invention has the following advantages: the adopted catalyst does not need to be prepared in advance and is relatively cheap; the raw material methyl butenol can be adopted for isomerization synthesis of 3-methyl-2-buten-1-ol in a water-containing condition; and the reaction activity and selectivity are relatively high.